Requesting VLF dump data

To obtain dump data for a VLF class, you need to dump both the VLF address space and its associated data spaces. First, use the DISPLAY command to determine the data spaces assigned to the VLF job:
 D J,VLF
Then, use the DUMP command to dump the data, replacing clsname with the name of a VLF class:
 DUMP COMM=(DUMP OF VLF)
The system issues message IEE094D to prompt the operator for information. Enter the following replies:
 R xx,JOBNAME=VLF,CONT
 R yy,DSPNAME=('VLF'.Dclsname,'VLF'.Cclsname),END

See z/OS MVS System Commands for more information about the DISPLAY and DUMP commands.